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Siemens Building Technologies
HVAC Products
20
Function block LPB parameters
20.1
Operating lines
Line
Function, parameter
131
Device number for bus address
132
Segment number for bus address
133
Clock mode
134
Bus power supply, operating mode and status indication
135
Outside temperature source
136
Gain of locking signal
137
Response to uncritical locking signals from the data bus
20.2
LPB parameters
20.2.1 Addressing the devices
Each device connected to the data bus (LPB) requires an address. This address is
comprised of a device number (1...16, operating line 131) and a segment number
(0...14, operating line 132).
In an interconnected plant, each address may be assigned only once. If this is not ob-
served, proper functioning of the entire plant cannot be ensured. In that case, a fault
status signal will be generated (error code 82).
If the controller is operated autonomously (with no bus), both the device number and
the segment number must be set to zero.
Since the device address is also associated with control processes, it is not possible to
permit all possible device addresses in all types of plant:
If an inadmissible address has been entered for the selected type of plant, a fault status
signal will appear (error code 140).
For detailed information about the addressing of devices, refer to Data Sheet N2030.
20.2.2 Source of time of day
Depending on the master clock, different sources for the time of day can be used. The
source must be entered on the controller on operating line 133, as a digit (0...3):
0 = autonomous clock in the RVD240
1 = time of day from the bus; clock (slave) with no remote readjustment
2 = time of day from the bus; clock (slave) with remote readjustment
3 = time of day on the bus; central clock (master)
The effect of the individual entries is as follows:
Input
Effect
• The time of day on the controller can be
0
readjusted
• The controller's time of day is not
matched to the system time
• The time of day on the controller cannot
1
be readjusted
• The controller's time of day is automati-
cally and continually matched to the sys-
tem time
Basic documentation RVD240
20 Function block LPB parameters
Unit
Factory
Range
setting
0
0...16
0
0...14
0
0...3
A
0 / 1 / A
A
A / 00.01...14.16
%
100
0...200
1
0 / 1
Diagram
Adjustment
System time
Controller time
Adjustment
Controller time
System time
CE1P2384en
27.05.2004
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